<template>
  <div>
    <h1>商品分类参数组件</h1>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 主体区域 -->
    <el-card>
      <el-alert show-icon title="注意：只允许为第三季分类设置相关参数！" :closable="false" type="warning"></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_pot">
        <el-col>
          <span>请选择商品分类：</span>
          <!-- 选择商品分类的级联 -->
          <el-cascader
            v-model="selectedKeys"
            :options="cateList"
            :props="cascaderProps"
            @change="handleChange"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加动态参数按钮 -->
          <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
          <!-- 动态参数的表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleCloseTag(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加静态属性的按钮 -->
          <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleCloseTag(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      @close="addDialogClosed"
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="30%"
    >
      <!-- <span>添加参数</span> -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      @close="editDialogClosed"
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="30%"
    >
      <!-- <span>添加参数</span> -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 级联选择框双向绑定的数组
      selectedKeys: [],
      // 级联选择框的配置对象
      cascaderProps: { value: 'cat_id', label: 'cat_name', children: 'children', expandTrigger: 'hover' },
      // 商品分类列表
      cateList: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态参数的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
          { min: 2, max: 15, message: '长度在 2 到 15 个字符', trigger: 'blur' }
        ]
      },
      // 控制编辑对话框的显示与隐藏
      editDialogVisible: false,
      // 修改表单的数据对象
      editForm: {},
      // 修改表单验证的对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
          { min: 2, max: 15, message: '长度在 2 到 15 个字符', trigger: 'blur' }
        ]
      },
      // 控制展开行的按钮与文本框的切换形式
      inputVisible: false,
      // 文本框中输入的内容
      inputValue: ''
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类的列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        this.$message.error('获取商品分类列表失败！')
      }
      this.cateList = res.data
    },
    // 级联选中框选中项变化，会触发这个函数
    async handleChange () {
      this.getParamsData()
    },
    handleTabClick (tab, event) {
      this.getParamsData()
      console.log(tab, event, this.activeName)
    },
    // 获取参数的列表数据
    async getParamsData () {
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      console.log('证明选中的是三级分类', this.selectedKeys)
      // 根据所选分类的ID和当前所处的面板获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateID}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('参数获取失败！')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 添加一个布尔值 控制展开行文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log('获取到的参数信息', res.data)

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击确定按钮添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.post(`categories/${this.cateID}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        } else {
          this.$message.success('参数添加成功！')
          this.addDialogVisible = false
          this.getParamsData()
        }
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog (id) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateID}/attributes/${id}`,
        { params: { attr_sel: this.activeName } })

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 编辑对话框的关闭事件
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击确定修改参数
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateID}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        } else {
          this.$message.success('修改参数成功！')
          this.getParamsData()
          this.editDialogVisible = false
        }
      })
    },
    // 根据ID删除对应的参数项
    async removeParams (id) {
      console.log('点击了删除')
      const confirmResult = await this.$confirm('此操作将永久删除该参数，是否继续？', '提示', { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' }).catch(error => error)
      // 用户取消了删除
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除。')
      } else {
        // 用户点击了确认删除，执行删除的业务逻辑
        const { data: res } = await this.$http.delete(`categories/${this.cateID}/attributes/${id}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
      }
    },
    // 文本框失去焦点活按下回车键触发
    async handleInputConfirm (e) {
      console.log('tijiao')
      if (e.inputValue.trim().length === 0) {
        e.inputValue = ''
        e.inputVisible = false
        return false
      }
      // 如果没有return 证明输入了内容 需要进行后续的处理
      e.attr_vals.push(e.inputValue.trim())
      e.inputValue = ''
      e.inputVisible = false
      // 需要发起请求，保存这一次操作
      this.saveAttrVals(e)
    },
    // 将对attr_vals的操作保存到后台数据库
    async saveAttrVals (e) {
      const { data: Res } = await this.$http.put(`categories/${this.cateID}/attributes/${e.attr_id}`, {
        attr_name: e.attr_name,
        attr_sel: e.attr_sel,
        attr_vals: e.attr_vals.join(' ')
      })
      if (Res.meta.status !== 200) {
        return this.$message.error('添加参数项失败!')
      }
      this.$message.success('修改参数成功！')
    },
    // 点击按钮展示文本输入框
    showInput (e) {
      e.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除tag参数标签
    handleCloseTag (i, row) {
      console.log('删除标签！', i, row)
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
      console.log(row)
    }
  },
  computed: {
    isBtnDisabled () {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的ID
    cateID () {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      }
      return null
    },
    // 计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style>
.el-cascader {
  width: 70%;
}
.el-cascader-menu {
  height: 300px;
  width: 100%;
}
.cat_pot {
  margin: 15px 0;
}
.el-tag {
  margin: 11px;
}
.input-new-tag {
  width: 120px;
}
</style>
